[LU-4231] NFS reexport leads to LBUG in mainline 3.12 client

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.6.0, Lustre 2.5.1
• Affects Version/s: Lustre 2.4.1, Lustre 2.5.0
• Environment: - Client mainline kernel 3.12 / lustre-utils 2.4.0; - Servers lustre 2.4.0/ZFS OSDs; - ko2iblnd; - reexport works with 2.6.32/2.4.0 client
• Severity: 4
• Assignee: Dmitry Eremin (Inactive)
• Reporter: Roland Fehrenbacher

Description

[ 1007.910111] LustreError: 9425:0:(llite_internal.h:1091:ll_inode2fid()) ASSERTION( inode != (
(void *)0) ) failed:
[ 1007.920862] LustreError: 9425:0:(llite_internal.h:1091:ll_inode2fid()) LBUG
[ 1007.929703] Kernel panic - not syncing: LBUG
[ 1007.933988] CPU: 0 PID: 9425 Comm: rpc.mountd Tainted: P C O 3.12.0-rc7-ql-generic-10 #1
[ 1007.942781] Hardware name: Supermicro X8DTN/X8DTN, BIOS 080015 05/04/2009
[ 1007.949668] 0000000000000000 ffff8801b20b3a38 ffffffff814fd482 0000000000000007
[ 1007.957158] ffffffffa04e66bd ffff8801b20b3ab8 ffffffff814faa1f ffffffff815eb50a
[ 1007.964647] ffffffff00000008 ffff8801b20b3ac8 ffff8801b20b3a68 ffffffffa0b6ba0e
[ 1007.972144] Call Trace:
[ 1007.974607] [<ffffffff814fd482>] dump_stack+0x46/0x58
[ 1007.979759] [<ffffffff814faa1f>] panic+0xb6/0x1c6
[ 1007.984632] [<ffffffffa04cab50>] lbug_with_loc+0xb0/0xb0 [libcfs]
[ 1007.990892] [<ffffffffa0b40635>] ll_encode_fh+0x165/0x170 [lustre]
[ 1007.997244] [<ffffffffa03b601b>] exportfs_encode_inode_fh+0x1b/0xa0 [exportfs]
[ 1008.004707] [<ffffffffa03b60f0>] exportfs_encode_fh+0x50/0x70 [exportfs]
[ 1008.011581] [<ffffffffa03bd4bb>] _fh_update.isra.9.part.10+0x3b/0x50 [nfsd]
[ 1008.018716] [<ffffffffa03be011>] fh_compose+0x241/0x520 [nfsd]
[ 1008.024719] [<ffffffffa03c4244>] exp_rootfh+0x104/0x2a0 [nfsd]
[ 1008.030725] [<ffffffffa03bb7a9>] write_filehandle+0x179/0x200 [nfsd]
[ 1008.037250] [<ffffffff811156a5>] ? alloc_pages_current+0xb5/0x180
[ 1008.043505] [<ffffffff810d8839>] ? __get_free_pages+0x9/0x40
[ 1008.049329] [<ffffffff810d8881>] ? get_zeroed_page+0x11/0x20
[ 1008.055156] [<ffffffffa03bb630>] ? write_unlock_ip+0xd0/0xd0 [nfsd]
[ 1008.061596] [<ffffffffa03baff8>] nfsctl_transaction_write+0x58/0x80 [nfsd]
[ 1008.068642] [<ffffffff81137995>] vfs_write+0xc5/0x1d0
[ 1008.073854] [<ffffffff81137e3d>] SyS_write+0x4d/0xa0
[ 1008.078985] [<ffffffff81507479>] ? do_page_fault+0x9/0x10
[ 1008.084549] [<ffffffff8150a066>] system_call_fastpath+0x1a/0x1f
[ 1008.091486] -----------[ cut here ]-----------

Issue Links

• is duplicated by: LU-3717 Kernel panic in ll_encode_fh() while testing file handle syscalls on FC18 client
• is related to: LU-4416 support for 3.12 linux kernel